A hollow, conducting sphere with an outer radius of 0.257 m and an inner radius of 0.203m has a uniform surface charge density of +6.31×10−6C/m^2 . A charge of -0.870uC is now introduced into the cavity inside the sphere. Required:
a. What is the new charge density on the outside of the sphere?
b. Calculate the strength of the electric field just outside the sphere.
c. What is the electric flux through a spherical surface just inside the inner surface of the sphere?

increase masses, decrease separation

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.

answer: d. objects on jupiter experience more gravity due to more gases